My download directory is on a removable drive that usually ends up as F:. If I forget to mount that drive and open NB, it will correctly warn me that the DL directory does not exist. If a different drive that does not have the user specified DL directory on it is mounted as F: I will get the warning but upon downloading it will just create the directory. This is OK but a further warning would be nice.
The big problem occurred when I had no drive mounted as F: and then forgot and downloaded a file. It started by downloading all the par2 volume files first and then started DLing the main files. The DL list shows it being DLed to the directory on F: yet there is no F: The downloaded files are nowhere to be found. They are not in NBs default DL dir in my documents either.
The files had the pause icon by them but it DLed them anyway.